advice

so I have been with my husband for almost 6 yrs. we have married for 3. but we fight slot. we are like hit and cold good than fight etc. for 4 yrs now he has been constantly accusing me of cheating on him. ( which I am not, I would never do that I love him to much to) but it don't matter how much I tell him I love him he don't believe me. he says he sees the signs. like for example in the winter his tire tracks got his jealousy going. and he says that I don't show him I love him. but I'm always giving him kisses, telling him I love him, hugs. etc. so what do I so?